The meaning and function of rubber blending

- Jun 17, 2019-

Meaning of rubber blending

Improve process performance, service performance and technical and economic performance.

More than 70% of rubber is processed and used in the form of rubber or rubber and plastic.

Process compatibility of rubber

By mixing thermodynamic incompatible systems mechanically or under other conditions, a sufficiently stable blend can be obtained, which forms a heterogeneous form in the microscopic region but maintains its uniformity in the macroscopic region.

Influencing factors of polymer blending:

Mixing process conditions: time, strength, roll temperature, processing method

Composition: raw rubber, blending ratio, compatibility agent, processing assistant

[use all kinds of rubber]

A combination of natural rubber and butadiene rubber


Ratio: 75 ~ 50/25 ~ 50

Objective: to improve the vulcanization temperature, heat resistance, cold resistance, elasticity and abrasion resistance

Products: conveyor belt, rubber shoes

Natural rubber and styrene-butadiene rubber


Proportion: arbitrary

Objective: to improve the abrasion resistance of NR and to improve ozone crack resistance of tread grooves

Products: tires and other products

Styrene-butadiene rubber + butadiene rubber

SBR and BR

Proportion: arbitrary

Objective: to improve wear resistance, elasticity and cold resistance

Product: tread

Four, styrene-butadiene rubber + high styrene

SBR+ high styrene

Ratio: 75 ~ 50/25 ~ 50

Objective: to improve abrasion resistance, tear strength and tensile strength

Sole and sponge

Five, styrene-butadiene rubber + high density polyethylene


Ratio: 100/5 ~ 20

Objective: to improve the process performance, reduce the scorch tendency and shrinkage of rubber, and improve the abrasion resistance and ozone resistance of vulcanized rubber

Products: sole and sponge rubber

Ethylene propylene rubber + butyl rubber


50/50 scale:

Objective: to improve tear resistance, heat resistance and ozone resistance.

Improve tread wear resistance

Products: tread, inner tube, etc

Ethylene propylene rubber + chlorinated butyl rubber


50/50 scale:

Objective: to improve ozone resistance

Product: tire side

Eight, butadiene rubber + ethylene propylene rubber

Butadiene rubber +EPDM

Proportion: arbitrary

Objective: to improve heat resistance, ozone resistance and chemical resistance

Product: tread



Proportion: arbitrary

Objective: to maintain the oil and heat resistance of NBR.

Improve ozone resistance, wear resistance, flame resistance and dielectric properties

Products: oil resistant rubber, shoes, hose, line cover

NBR+ phenolic resin

Proportion: arbitrary

Objective: to improve the viscosity, hardness, wear resistance and strength of NBR

Products: gasket, lining

Nitrile butadiene rubber + natural rubber or styrene-butadiene rubber

NBR + NR and SBR

Ratio: NR or SBR≤40%

Objective: to improve the cold resistance and reduce the cost of NBR, but other NBR properties are slightly reduced

Products: oil resistant soles, leather bowls

12. Nitrile butadiene rubber and neoprene


Proportion: arbitrary

Objective: to improve weather resistance and ozone resistance

Products: outdoor oil resistant products

NBR + epdm


Objective: to improve weather resistance and ozone resistance

14. Neoprene + natural rubber


80/20 scale:

Objective: to improve the process performance of CR

Products: conveyor belt or cover glue

15. Neoprene + nitrile butadiene rubber


Proportion: arbitrary

Objective: to improve the roll sticking, pressing, calendering and oil resistance of CR

16. Neoprene + butadiene rubber


Ratio: 90 ~ 60/10 ~ 40

Objective: to improve the cold resistance, wear resistance and elasticity of CR, and to improve the process properties of pressing, calendering, roll sticking and burning

Products: rubber tape, shock absorption rubber

[typical combination of rubber and plastic]

1. PVC and rubber blends:

Compared with NBR, NBR/PVC has improved strength, flame retardant, abrasion resistance, solvent resistance and ozone cracking resistance, and significantly improved processing performance and foaming performance of sponge.

PE and rubber blends:

Many kinds of rubber, such as PE and NR, have good mixing effect.

3. High styrene and rubber blends:

High styrene and rubber blend material of high strength, wear-resistant, easy processing, rolling, pressing semi-finished products surface smooth.

Ethylene propylene diene rubber/polypropylene (EPDM/PP)

Excellent weather resistance, ozone resistance, uv resistance and good high temperature resistance, impact resistance, oil and solvent resistance and general chloroprene rubber, can be used in common thermoplastic processing equipment for processing, has the advantages of simple processing, low cost, continuous production and recycling.